Intertidal and submarine groundwater discharge on the west coast of Ireland

Cave, Rachel; Henry, Tiernan

doi:10.1016/j.ecss.2011.01.019

Cited by 35 publications

(53 citation statements)

References 30 publications

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“…Therefore, this study uses the natural tracer salinity, represented as EC, to quantify the SiGD into Bell Harbour. This was previously estimated by Perriquet (2014) using a tidal prism approach developed by Cave and Henry (2009). Interestingly, the lowest estimated discharge in the current study matches that in the previous work, which was found to be close to 0 m 3 /s in May 2011.…”

Section: Discussionsupporting

confidence: 80%

“…However, given the nature of the discharge locations, direct physical measurement of SiGD or purely SGD is not possible with the types of gauging methods used at onshore springs. Instead, studies have applied direct and indirect methods for measuring the mass transfer of groundwater across the sea floor (Zektser et al 2007) or towards a surface water body, including (1) measuring the seepage flow rate using seepage meters (Carr and Winter 1980;Corbett et al 2003) or multilevel onshore piezometers (Freeze and Cherry 1979;Taniguchi and Fukuo 1996), (2) applying mass-balance approaches using natural geochemical tracers such as electrical conductivity (EC), short-lived radium and radon isotopes, i.e. 222 Rn, 223 Ra, 224 Ra, 226 Ra, or oxygen-18 (δ 18 O) and deuterium (δ 2 H) (Moore 2006;Peterson et al 2008;Santos et al 2008;Cave and Henry 2011;Lee et al 2012;Null et al 2014;Knee et al 2016), (3) applying water balance approaches based on the contributing catchment (Sekulic and Vertacnik 1996;Smith and Nield 2003), (4) using hydrograph separation techniques to quantify the groundwater contribution of surface-water streams and extrapolating this contribution to the coastal shore (Zektser et al 2007), (5) employing numerical modelling (Thompson et al 2007;McCormack et al 2014;Taniguchi et al 2015), and (6) using thermal imaging from remote sensing (Johnson et al 2008;Wilson and Rocha 2012;Tamborski et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Submarine and intertidal groundwater discharge through a complex multi-level karst conduit aquifer

et al. 2018

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The quantification of submarine and intertidal groundwater discharge (SiGD) or purely submarine groundwater discharge (SGD) from coastal karst aquifers presents a major challenge, as neither is directly measurable. In addition, the expected heterogeneity and intrinsic structure of such karst aquifers must be considered when quantifying SGD or SiGD. This study applies a set of methods for the coastal karst aquifer of Bell Harbour in western Ireland, using long-term onshore and offshore time series from a high-resolution monitoring network, to link catchment groundwater flow dynamics to groundwater discharge as SiGD. The SiGD is estimated using the Bpollution flushing model^, i.e. a mass-balance approach, while catchment dynamics are quantified using borehole hydrograph analysis, single-borehole dilution tests, a water balance calculation, and cross-correlation analysis. The results of these analyses are then synthesised, describing a multi-level conduit-dominated coastal aquifer with a highly fluctuating overflow regime draining as SiGD, which is in part highly correlated with the overall piezometric level in the aquifer. This concept was simulated using a hydraulic pipe network model built in InfoWorks ICM [Integrated Catchment Modeling] ® version 7.0 software (Innovyze). The model is capable of representing the overall highly variable discharge dynamics, predicting SiGD from the catchment to range from almost 0 to 4.3 m 3 /s. The study emphasises the need for long-term monitoring as the basis for any discharge studies of coastal karst aquifers. It further highlights the fact that multiple discharge locations may drain the aquifer, and therefore must be taken into consideration in the assessment of coastal karst aquifers.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Submarine and intertidal groundwater discharge through a complex multi-level karst conduit aquifer

et al. 2018

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“…The contemporary hydrology in Murree reflects the karst limestone geology, which is subject to submarine groundwater discharge with inputs of fresh water to coastal zones and recharge with saline incursions (Cave and Henry 2011). Ground-water discharge and saline recharge help to maintain water budgets of coastal lakes and dissolved chemical constituents affect the salinity and play a role in the biological species composition and productivity (Barlow 2003).…”

Section: Discussion Modern Hydrological Dynamics and Ecologymentioning

confidence: 99%

“…The area is characterised by Carboniferous limestone that fringes the southern sides of Galway Bay and extends into the sublittoral zone. Kinvara (c. 12km from Murree) represents the focal point for a large part of the underground drainage from the north Burren lowlands (Cave and Henry 2011). Submarine and intertidal karst springs can be observed along the coastline and groundwater resurgences have been identified (Mullan 2003;Cave and Henry 2011).…”

Section: Study Sitementioning

confidence: 99%

The Palaeolimnology of Lough Murree, A Brackish Lake in the Burren, Ireland

Cassina¹,

Dalton²,

Eyto³

et al. 2013

Biology & Environment: Proceedings of the Royal Irish Acade

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Lough Murree, a rock/karst barrier lagoon, is superficially isolated from the sea and seasonal variations in lake water level reflect precipitation and groundwater variation. Lake salinity is influenced by subsurface saline intrusions, occasional barrier overwash together with precipitation and groundwater inflow, leading to poikilohaline conditions. Palaeolimnological reconstructions in Murree support the supposition that the lagoon was once superficially connected to the sea around the mid-nineteenth century. Physical, chemical and biological proxies suggest an evolution to more freshwater conditions. Uncertainties about the timing of the transition persist because of an unresolved sediment chronology. The isolation of Murree from the Atlantic Ocean has promoted the formation of dense charophyte beds composed of lagoonal specialist species, which are able to tolerate large variations in salinity.

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“…For these conceptual similarities, SGD have been termed 'submarine estuaries' (Moore, 1999). As in "conventional" estuaries, where the freshwater inflow is a major structuring factor of biological communities (Montagna and Kalke, 1992), changes in salinity due to freshwater flow from SGD also has the ability to influence the distribution of organisms (Miller and Ullman, 2004;Cave and Henry, 2011). SGD have also been shown to affect local sediments characteristics.…”

Section: Introductionmentioning

confidence: 99%